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IR Player block

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Available on which products

  • Axe-Fx III: 2 blocks
  • FM3: no
  • FM9: no
  • Axe-Fx II: no
  • AX8: no
  • FX8: no

Channels or X/Y switching

  • Axe-Fx III: 4 channels

What is the IR Player

The IR Player block is a simplified Cab block.

It processes a single IR, has less features than the Cab block and therefore requires less CPU. It can also process Tone Match block data which has been exported as an IR. This makes it the first choice to run an impulse response of a device such an acoustic guitar or a preamp.

Read this:

"The IR Player block does not attempt to normalize the volume as it is a generic convolution player and doesn't know whether the IR is a cabinet IR or some other type of IR (i.e., reverb, violin, etc.)." [1]

Phase correction

"The Cab and IR Player blocks automatically "phase correct" IRs so that the peak signal is positive." [2]

"When an IR is read from storage the first few hundred samples are scanned and the maxima is found. If the maxima is a negative value the polarity of the IR is inverted because it is assumed the polarity of the IR was inverted when captured. This can happen if the speaker is wired backwards, the IR is captured from the back of the cabinet, the back of a ribbon mic is used, or a polarity inversion occurs in the power amp or mic preamp." [3]

FullRes IRs

Firmware 17 and later for the Axe-Fx III make the IR Player compatible with FullRes IRs. The IR Player block supports two IRs with individual level and pan controls for each IR. Setting the IR Length to OFF defeats the IR. A Mix control is also provided so the block can be used as a convolution reverb. A Mode control allows the two IRs to be in parallel or series. When in series the individual level and pan controls are defeated and removed from the UI.



The MODE parameter selects between Parallel and Series (firmware 17 and later for the Axe-Fx III).

The volume is consistent if Mode is set to Parallel and only one IR is being used.

IR Length

Choices are: Off, 256, 512, 1024 and Max (firmware 17 and later for the Axe-Fx III).